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#21771 10/21/2003 1:58 AM | Joined: May 2003 Posts: 111 Member | | Member Joined: May 2003 Posts: 111 | Ok guys I want to make sure I have this right. I just installed a rebuilt Carb on my truck (1968 c10, 250cid, manual choke, rochester 1bbl). There are 2 vacuum nipples on the carb,one on the drivers side (next to the mixture screw), and one on the passenger side up near the throat.
Which one should be running to the Vacuum advance on the distributer, or does it matter? Currently I'm using the bottom (with the other one capped) and it seems to be running good.
35 + years of rollin' steel!
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#21772 10/21/2003 5:21 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Ported vacuum is above the base on this carb. An easy way to check is to see if the vacuum modulator moves when the engine is reved.
Fred
52 3600
69 C-10
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#21773 10/21/2003 6:47 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | I thought someone had some good info on this subject 
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#21774 10/21/2003 8:44 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The one you want is by the mixture screw on the throttle linkage side of the carb. The one on the base is for the vacuum choke pulloff if you have an auto choke.
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#21775 10/21/2003 1:24 PM | Joined: May 2003 Posts: 111 Member | | Member Joined: May 2003 Posts: 111 | Thanks. I tried looking up in my books (chiltons and clymers) but no diagrams for vacuum. BTW: both operate the advance, I just wanted to know which was better for it. Even if I feel dumb asking it, I know some else has the same question. Thanks again to the responders.
35 + years of rollin' steel!
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